This research area aims to further our knowledge of inter-and intra-individual variability of human behaviors. Variability in various areas (cognitive, social, motor, motivational…) is analyzed with a functional, organizational or developmental focus, and leads to designing assessment tools (standardized or ecological assessment) and programs for care or remediation.


Research Program 1: Psychometric development of assessment tools

Modeling variability requires the development of specialized methodological tools, particularly psychometric score models that directly implement the notion of development (and the perturbation of this development) in dynamic models using task, time and subject parameters.


Research Program 2: Handicap, developmental and aging disorders

Developmental and aging disorders, as well as handicap, are major aspects of variability. This research program is interested in studying these atypical individual trajectories, in comparison with typical trajectories. The dual purpose of this program is to better understand processes involved in atypical variability, and to further our means to limit the functional impact of handicap. Our theoretical framework includes experimental psychology (developmental psychology, cognitive psychology), psychopathology (developmental psychopathology, cognitive psychopathology), and neuropsychology, through a combination of fundamental and applied research.


Research Program 3: Adaptative testing of individual transversal skills

We consider the assessment of skills throughout development (and the variability of these skills across groups) through the prism of designing remediation programs that automatically adapt to an individual (adaptive testing and adaptive teaching). In this program, we work on developing the TACIT digital platform (Testing Adaptatif des Compétences Individuelles Transversales, for adaptive testing of individual transversal skills), whose function is to adaptively assess and remedy individual transversal skills (understanding implicit meaning in written texts, vocabulary knowledge, numeracy skills, decoding in reading, orthographic skills, digital skills…). We also work on related tools (such as Tacit-grammar, for learning English grammar).


Research Program 4: Major educational difficulties and learning disorders

This program engages in research on the major skills learned at school (reading, orthographic skills, graphic motor gestures, numeracy…), with a focus on applied research in the fields of health and education. The overarching goal is to investigate heterogeneity of learning profiles, so as to make it possible to design diagnostic assessment tools, learning aids, and remediation programs.